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A novel water-soluble copolyamide based on Nylon 66 was synthesized via solution-melt polycondensation of hexanedioic acid and sodium 5-sulfoisophthalate with 1,6-diaminohexane. The chemical structures of the products were ascertained by various spectroscopic techniques (FT-IR, Raman, and 1H NMR). The thermal properties of the polyamides under consideration were measured by TGA and DSC. According...
Dynamic mechanical analysis (DMA) was applied to investigate the correlation between dynamic mechanical behaviors of regenerated silk fibroin (RSF) and its structural transition which was characterized by near-infrared (NIR) spectroscopy. The tanδ peak split of DMA demonstrated that the apparent glass transition of amorphous RSF film (at around 177°C) was the contribution of both uncrystallizable...
An all-silk composite, in which uniaxially-aligned and continuous-typed Bombyx mori silk fibers were embedded in a matrix of silk protein (fibroin), was successfully prepared via a solution casting process. The structure, morphology, mechanical and thermal properties of such silk fiber/fibroin composites were investigated with X-ray diffraction, scanning electron microscopy, tensile and compression...
Starting from a kinetically foldable criterion for designing fast-folding structures, we have investigated the foldabilities of all possible sequences coded in two letters through an exhaustive enumeration of model chains of a 16-mer protein that we performed using a simple off-lattice model. From a set of 32,896 sequences, we found only 145 sequences that were foldable. Through a comparison of the...
Computational methods are described and applied to study how to develop coarse-grained force fields for cis-poly(1,4-butadiene) from the atomistic simulation. We developed an iterative method for potential inversion from distribution functions for the polymer systems. Then, we analyzed the static character and dynamic character from atomistic simulation and coarse-grained (CG) simulation as a simple...
We present the results of Monte Carlo simulations of self-assembly in melt of pseudo-block copolymer formed through the association of associating polymer chains with attractive end-groups (sticker sites). Complexities of the phase structures result from these pseudo-block copolymers strongly depend on parameters, such as attractive interaction strength between two stickers and chain length of associating...
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